Buggy code:
public class FinderCacheImpl implements FinderCache < ClassMapping , SelectExecutor , Result > { private static final String PATTERN_SEPARATOR = "\\;" ; private static final String EXLUDED_BY_USER = "Excluded<seq2seq4repair_space>by<seq2seq4repair_space>user" ; private final Map < ClassMapping , FinderQuery < ClassMapping , SelectExecutor , Result > > _delegate ; private final Map < String , String > _uncachables ; private List < String > _exclusionPatterns ; private QueryStatistics < ClassMapping > _stats ; private ReentrantLock _lock = new ReentrantLock ( ) ; private Log _log ; private Localizer _loc = Localizer . forPackage ( FinderCacheImpl . class ) ; public FinderCacheImpl ( ) { } public Map < String , String > getMapView ( ) { } public QueryStatistics < ClassMapping > getStatistics ( ) { } public FinderQuery < ClassMapping , SelectExecutor , Result > get ( ClassMapping mapping , FetchConfiguration fetch ) { if ( ( fetch . getReadLockLevel ( ) ) != 0 ) return null ; boolean ignore = isHinted ( fetch , HINT_IGNORE_FINDER ) ; boolean invalidate = isHinted ( fetch , HINT_INVALIDATE_FINDER ) ; if ( invalidate ) invalidate ( mapping ) ; if ( ignore ) return null ; FinderQuery < ClassMapping , SelectExecutor , Result > result = _delegate . get ( mapping ) ; <START_BUG> _stats . recordExecution ( mapping , ( result != null ) ) ; <END_BUG> return result ; } public FinderQuery < ClassMapping , SelectExecutor , Result > cache ( ClassMapping mapping , SelectExecutor select , FetchConfiguration fetch ) { } private FinderQuery < ClassMapping , SelectExecutor , Result > put ( ClassMapping mapping , SelectExecutor select ) { } public boolean isExcluded ( ClassMapping mapping ) { } private boolean isExcluded ( String target ) { } public void addExclusionPattern ( String pattern ) { } public void removeExclusionPattern ( String pattern ) { } private String getMatchedExclusionPattern ( String id ) { } private Collection < ClassMapping > getMatchedKeys ( String pattern , Set < ClassMapping > set ) { } private Collection < String > getMatchedKeys ( String pattern , Collection < String > coll ) { } boolean matches ( String pattern , ClassMapping mapping ) { } boolean matches ( String pattern , String target ) { } public boolean invalidate ( ClassMapping mapping ) { } public FinderQuery < ClassMapping , SelectExecutor , Result > markUncachable ( ClassMapping mapping ) { } public FinderQuery < ClassMapping , SelectExecutor , Result > markUncachable ( String id ) { } private FinderQuery < ClassMapping , SelectExecutor , Result > markUncachable ( String cls , String reason ) { } private FinderQuery < ClassMapping , SelectExecutor , Result > markUncachable ( ClassMapping mapping , String reason ) { } ClassMapping searchMappingByName ( String cls ) { } public void setExcludes ( String excludes ) { } @ SuppressWarnings ( "unchecked" ) public List < String > getExcludes ( ) { } boolean isHinted ( FetchConfiguration fetch , String hint ) { } void lock ( ) { } void unlock ( ) { } public void startConfiguration ( ) { } public void setConfiguration ( Configuration conf ) { } public void endConfiguration ( ) { } }

Fix:
_stats . recordExecution ( mapping ) ;